linux.git/arch/arc, branch v3.9-rc2

ARC: split elf.h into uapi and export it for userspace

2013-02-27T14:30:26+00:00

Signed-off-by: Vineet Gupta

ARC: Fixup the current ABI version

2013-02-27T14:30:25+00:00

The upstream kernel ABI (v3) is different from current out-of-tree (v2):
* no-legacy-syscalls
* user_regs_struct layout has changed

So we rev up the ABI version

Signed-off-by: Vineet Gupta

ARC: gdbserver using regset interface possibly broken

2013-02-27T14:29:55+00:00

ptrace regset interface relies on ELF_NGREG for ceiling the size of user
request. So any larger request (even if legit)  would be clipped.

The existing def of ELF_NGREG didn't use user_regs_struct and was
technically one placeholder short (stop_pc) - although the current code
would still work because pt_regs includes a bunch of extra fields,
making
      ELF_NGREG >= sizeof(struct user_regs_struct)/sizeof(long)

But we need to remove this ambiguity, specially since pt_regs should NOT
be directly associated with with anything userspace-ish.

Signed-off-by: Vineet Gupta

ARC: Kconfig cleanup tracking cross-arch Kconfig pruning in merge window

2013-02-26T08:55:22+00:00

Since ARC port was not yet upstream, we missed a bunch of cross-arch
Kconfig removals:

* GENERIC_SIGALTSTACK: d64008a8f3 "burying unused conditionals"
* HAVE_IRQ_WORK: 6147a9d807 "irq_work: Remove CONFIG_HAVE_IRQ_WORK"
* ARCH_NO_VIRT_TO_BUS: e0cf2ef484 "arch Kconfig: centralise
                                   CONFIG_ARCH_NO_VIRT_TO_BUS"

Signed-off-by: Vineet Gupta

ARC: make a copy of flat DT

2013-02-26T08:55:18+00:00

The flat DT (currently embedded in vmlinux) is in .init section.
The unflattened/binary tree doesn't copy strings through and references
them from orig flat DT - which could cause catestrohpy if of_* APIs are
called post init, say from a driver which is a loadable module.

Reported-by: James Hogan 
Signed-off-by: Vineet Gupta

ARC: [plat-arcfpga] DT arc-uart bindings change: "baud" => "current-speed"

2013-02-15T17:46:22+00:00

Per Grant's review comment - driver changes via tty tree

Signed-off-by: Vineet Gupta

ARC: Ensure CONFIG_VIRT_TO_BUS is not enabled

2013-02-15T17:46:21+00:00

Signed-off-by: Vineet Gupta 
Reported-by: James Hogan

ARC: Fix pt_orig_r8 access

2013-02-15T17:46:21+00:00

Syscall restarting fixes made pt_regs->orig_r8 a short word, which was
not reflected in the assembler code - thus could potentially break gdb
debugging.

Signed-off-by: Vineet Gupta

ARC: [3.9] Fallout of hlist iterator update

2013-02-15T17:46:20+00:00

Commit 0bbacca "hlist: drop the node parameter from iterators" changed
the iterator across the board - but ARC port being out-of-tree missed
it.

Signed-off-by: Vineet Gupta

ARC: 64bit RTSC timestamp hardware issue

2013-02-15T17:46:20+00:00

The 64bit RTSC is not reliable, causing spurious "jumps" in higher word,
making Linux timekeeping go bonkers. So as of now just use the lower
32bit timestamp.

A cleaner approach would have been removing RTSC support altogether as the
32bit RTSC is equivalent to old TIMER1 based solution, but some customers
can use the 32bit RTSC in SMP syn fashion (vs. TIMER1 which being incore
can't be done easily).

A fallout of this is sched_clock()'s hardware assisted version needs to
go away since it can't use 32bit wrapping counter - instead we use the
generic "weak" jiffies based version.

Signed-off-by: Vineet Gupta